Centrifugal impeller and centrifugal pump

A centrifugal pump comprising a centrifugal impeller, wherein

• the centrifugal impeller has at least one centrifugal vane extending from a center part toward an outer circumferential edge of the centrifugal impeller, and
• the centrifugal vane has:
• a negative-pressure surface extending from the center part to the outer circumferential edge of the impeller;
• a pressure surface positioned away from the negative-pressure surface such that the centrifugal vane has a predetermined thickness, and extending from the center part toward the outer circumferential edge of the impeller;
• and
• a second pressure surface connected to the pressure surface and positioned closer to the negative-pressure surface than a virtual plane obtained by continuously extending the pressure surface to the outer circumferential edge, on the outer circumferential edge side of the impeller and inward of the outer circumferential edge.